Weighing-scale.



UNITED STATES PATENT OFFICE.

ARTHUR SPEAK, OF CHICAGO, ILLINOIS, ASSIGNOR TO ESSINGTON N. GILFILLAN,OF SAME PLACE.

WEIGHING-SCALE.

SPECIFICATION forming part of Letters Patent No. 650,994, dated June 5,1900. Application filed 0ctohei'28, 1899. Serial No.735,030. (No model.)

T0 to whont it may concern.-

Be it known that I, ARTHUR SPEAR, a citizen of the United States,residing at No. 56 Fifth avenue, in the city of Chicago, county of Cook,and State of Illinois, have invented certain new and useful Improvementsin VVeighing-Scales, of which the following is a full, clear, and exactspecification.

Myinvention relates to that class of weighing-scales in which the motionof the scalepan as heretofore constructed has been imparted to the arboror shaft of the pointer or index by means of a rack and pinion; and myinvention has for its primary objects to greatly simplify theconstruction of scales of this type and make the connection between theindex and. beam or other part connected with the scale-pan more positiveand accurate in its operation.

I/Vith these ends in View my invention consists in certain features ofnovelty in the 0011- struction, combination, and arrangement of parts bywhich the said objects and certain other objects hereinafter appearingare attained,- all as fully described with reference to the accompanyingdrawings, and more particularly pointed out in the claims.

In the said drawings, Figure 1 is a side elevation of my improved scale,partly in vertical section, and showing one of the end plates of thecasing alone. Fig. 2 isa vertical transverse section taken on the line 22, Fig. 1, and Fig. 3 is an enlarged perspective'view of the drum andcord hereinafter described.

In carrying out my invention I substitute for the rack and pinionaforesaid, which has heretofore been used for imparting the movement ofthe scale-pan 1 to the shaft or arbor 2 of the index or pointer 3, acord 4 and drum 5, around which the cord is wound. The drum 5 is securedin any suitable way to the arbor or shaft 2 of the index 3, the shaftbeing journaled in cross-bars 6, secured to the casing 7, and the cord 5is passed through the drum and then turned one or more times around itand has its upper end secured to apivoted arm 8, which is connected tothe stem 9 of the scalepan and serves as a scale-bea1n,while the lowerend of the cord is attached to a weight 10.

The lower end of the stem 9 is attached to an arm 11, and the latter issupported by a spiral or other suitable spring or yielding support 12,adjustably secured by set-screw 13 to a part 14c of the frame. Thus itwill be seen that when the beam 8 is oscillated the drum 5 will beaccordingly rotated and the index 3 moved around the dial 15. In orderto facilitate the weight 10 in pulling the cord downward when the plate1 rises, I prefer to provide the beam 8 with an auxiliary spring-arm 16,through which the cord 4 passes and which bears upon the upper side ofthe weight, thus holding the weight steady and at the same time pullingdownward on the cord when the beam 8 descends.

In describing and claiming my invention I have referred to the portion 1as a scale-pan but it will nevertheless be understood that this term panis used merely for the sake of convenience in description and isintended to include any device or support for the matter to be weighed.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent, is-

1. A weighing-scale having in combination a drum, an index operativelyconnected with said drum, a cord wound upon said drum, a scale-panoperatively connected with one end of said cord, a weight connected tothe other end of said cord, an arm operatively connected with said scale-pan and through which said cord loosely runs, substantially as setforth.

2. A weighing-scale having in combination a drum, an index operativelyconnected with said drum, a cord passing through and wound upon saiddrum, a scale-pan operatively con nected with one end of said cord, aweight connected to the other end ofsaid cord, an arm operativelyconnected with said scale-pan and having an eye through which said cordloosely runs,said eye being located above said weight, substantially asset forth.

ARTHUR SPEAR.

Witnesses:

F. A. I-IoPKINs, EDNA B. JOHNSON.

